1 Ocak 2019 Dergi makalesi Açık Erişim

Scharfenberger, Ulrike; Jeppesen, Erik; Beklioglu, Meryem; Sondergaard, Martin; Angeler, David G.; Cakiroglu, Ayse Idil; Drakare, Stina; Hejzlar, Josef; Mandy, Aldoushy; Papastergiadou, Eva; Sorf, Michal; Stefanidis, Konstantinos; Tuvikene, Arvo; Zingel, Priit; Adrian, Rita

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    <subfield code="a">Important drivers of gross primary production (GPP) and ecosystem respiration (ER) in lakes are temperature, nutrients, and light availability, which are predicted to be affected by climate change. Little is known about how these three factors jointly influence shallow lakes metabolism and metabolic status as net heterotrophic or autotrophic. We conducted a pan-European standardized mesocosm experiment covering a temperature gradient from Sweden to Greece to test the differential temperature sensitivity of GPP and ER at two nutrient levels (mesotrophic or eutrophic) crossed with two water levels (1 m and 2 m) to simulate different light regimes. The findings from our experiment were compared with predictions made according the metabolic theory of ecology (MTE). GPP and ER were significantly higher in eutrophic mesocosms than in mesotrophic ones, and in shallow mesocosms compared to deep ones, while nutrient status and depth did not interact. The estimated temperature gains for ER of similar to 0.62 eV were comparable with those predicted by MTE. Temperature sensitivity for GPP was slightly higher than expected similar to 0.54 eV, but when corrected for daylight length, it was more consistent with predictions from MTE similar to 0.31 eV. The threshold temperature for the switch from autotrophy to heterotrophy was lower under mesotrophic (similar to 11 degrees C) than eutrophic conditions (similar to 20 degrees C). Therefore, despite a lack of significant temperature-treatment interactions in driving metabolism, the mesocosm's nutrient level proved to be crucial for how much warming a system can tolerate before it switches from net autotrophy to net heterotrophy.</subfield>
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    <subfield code="a">Scharfenberger, Ulrike</subfield>
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    <subfield code="a">10.1002/lno.11064</subfield>
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    <subfield code="a">Effects of trophic status, water level, and temperature on shallow lake metabolism and metabolic balance: A standardized pan-European mesocosm experiment</subfield>
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    <subfield code="a">Angeler, David G.</subfield>
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    <subfield code="a">Cakiroglu, Ayse Idil</subfield>
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    <subfield code="a">Hejzlar, Josef</subfield>
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